• Reference-grade audiophile sound quality
• Closed, noise isolating design for luxuriously private listening
• Made in Germany from purpose-built materials
• Ring Radiator transducers for incredible detail and extension
• Glass Reflector plates with internal absorber system mimic the open sound of loudspeakers

Zero Compromise
The HD 820 fuses Sennheiser's bleeding-edge acoustic capabilities with exceptional reduction of ambient noise. Until now, the audiophile headphone experience could only begin with an open back design or loudspeakers. The HD 820 sacrifices neither detail nor sound field by using breakthrough acoustical systems in a closed, dynamic headphone.

Around-the-Ear
Luxuriously soft earpads rest around the ear for long-term comfort.

Closed Earcups
Escape your environment with a sealed design that attenuates the noise around you.

Wired
Comes with (2) cables for connecting to singled ended 1/4-inch (6.3mm) and balanced 4.4mm Pentaconn outputs such as headphone amplifiers, A/V receivers, audio interfaces and more.

Reflecting Within
The reference-class experience of the HD 820 is achieved with the use of precision concave glass reflectors, one capping each earcup. These functional plates reflect energy from the rear of the driver to a specially tuned absorber system, allowing the waves to mimic the behavior of open headphones such as the HD 800 S. The result is a sound stage never before experienced in a sealed headphone. The headphone’s vibration damping headband provides complete stability while reducing crosstalk. What you put into the HD 820 is precisely what you will get out of it. Each transducer is manufactured, tested, and measured to an extremely tight tolerance to ensure the most dependable performance out of the box. Each HD 820 also includes the frequency response plot unique to that set’s serial number, sparing no resource to help you retrieve the most critical details from every corner of your music collection.

Fellowship of the Ring
The 56mm Ring Radiator transducer found in the HD 820 leverages the key benefit of a large diaphragm speaker—air displacement. Both outer and inner edges of the “ring” are secured to the drive unit to keep it rigid for fast rest and response times. The result is accurate response spanning the entire frequency spectrum.

Let’s take a look at the specifications...

• Frequency response: 6 – 48,000 Hz
• Impedance: 300 Ohms
• THD: <0.02%
• Sensitivity: 103 dB at 1 kHz, 1V
• Cable: Detachable, 3 meters (9.8 feet) length
• Weight without cable: 360 grams (12.6 ounces)
• Included accessories: 3 meter cable with 6.3mm stereo plug (¼ inch), 3 meter balanced cable with 4.4mm Pentaconn plug, USB manual with frequency response plot, deluxe storage box

Shipping Note: Shipping to Alaska, Hawaii, P.O. Boxes, and APO addresses is not available for this item.

Warranty: 30 Day Woot

The units in this sale are being sold as open box condition. That means that they have been opened due to being a photo sample, a tested good customer return or having damaged packaging. Some non-essential items may be missing from the box. The unit may not be shipped in retail packaging. That is the reason for the reduced sale price and the reduced warranty.